MAINT: (re)add single axis idwt
MAINT: (re)add single axis idwt

kwohlfahrt/pywt,PyWavelets/pywt,michelp/pywt,michelp/pywt,rgommers/pywt,grlee77/pywt,eriol/pywt,PyWavelets/pywt,rgommers/pywt,kwohlfahrt/pywt,rgommers/pywt,eriol/pywt,grlee77/pywt,kwohlfahrt/pywt,michelp/pywt,eriol/pywt,rgommers/pywt